Double stranded blasting mat



July 5, 1949. J. s. MAZZELLA 2,474,904

DOUBLE-STRANDED BLASTING MAT Filed June 24, 1948 2 Sheets-Sheet 1 Afwavz'og, MAZZELLA.

July 5, 1949. J. s. MAZZELLA 2,474,904

' V DOUBLE-STRANDED BLASTING MAT Filed June 24, 1948 I 2 sheds-sheet. 2.

FIEIE y-517101? Patented July 5, i949 UNITED STATES PATENT OFFICE DOUBLESTRANDED BLASTING MAT Joseph S. Mazzella, New York, N. Y. ApplicationJune 24, 1948, Serial No. 35,000

4 Claims.

' 1 This invention relates to blasting mats, and aims to provide anovel, practical, useful and sturdy mat suitable for use in all mannerof blasting work, which is at the same time capable of standing repeateduse.

Another object of the invention is the provision of a blasting mat outof a single length of wire rope or cable, which is threaded into apattern to form a strong, durable and tough mat.

The above broad as well as additional and more specific objects willbecome apparent in the following description, wherein characters ofreference refer to like-numbered parts in the accompanying drawings. Itis to be noted that the drawings are intended solely for the purpose ofillustration, and that it is neither desired nor intended to limit theinvention necessarily to the exact details of construction shown exceptinsofar as they may be deemed essential to the invention.

Referring briefly to the drawings, Fig. 1 is a fragmentary plan view ofan example of a blasting mat constructed as disclosed below, embodyingthe instant invention.

Fig. 2 is a fragmentary enlargement of Fig. 1.

Fig. 3 is a diagrammatic view, in perspective, of a partially completedmat embodying the invention, illustrating the manner of weaving the wirerope to form the finished mat.

Fig. 4 is a sectional view taken on the line 4-4 of Fig. 3, and includesadditional parts which are made use of in the weaving of the mat.

Fig. 5 is a view similar to Fig. 4, showing, however, the next step inthe operation of weaving the mat.

Fig. 6 is a sectional view taken on the line 66 of Fig. 3.

Fig. '7 is a sectional View taken on the line '|'I of Fig. 3.

Referring in detail to the drawing, the numeral I indicates a completedblasting mat made in accordance with the principles of this invention,out of a single length of wire rope. Although the wire rope is shown inthe various views as though it were a single wire, in practice the saidrope is a stranded wire or cable.

In the construction of the mat l0, the method illustrated in Figs. 3-6,inclusive, is followed. In the instance illustrated, a row of equallyspaced pins or pegs H, twenty-nine in number, is driven into the floorl2, after passing through a slat l3. A similar slat I4 is provided,parallel with the slat l3, through which thirty similar pegs I aredriven, in staggered relation with respect to the pegs II.

The wire rope, indicated diagrammatically at I! in Fig. 3, is firstpassed around the end peg 15a in the manner shown, then across to andaround the end peg Ila and back again around the peg ilic. in thereverse direction, the two woofs thus provided being shown at Ilia. Thewire is then again looped around the next peg Nb and brought back againand passed around the next peg 15b. The latter operation is repeated allthe way down the line to the pegs H and I5 at the opposite end, so thatat the latter end there are also two strands l6d of the wire rope,forming the end woof at that end.

With the completion of the woof I611, the wire 15 is threaded throughthe pairs of woofs l6a, 1%, etc. in an upward direction (Fig. 3), thefirst warp thereof being positioned close against the pegs I5, as shown.Upon emerging from the uppermost Woof the, the wire I! is doubled backand again threaded through the pairs of woofs l6a, IBb, etc., but it isto be noted that the first warp ltc passes over every other or alternatepair of woofs it while the second or next warp I6e passes under the samepairs of woofs Hi. This operation is repeated throughout the width ofthe mat.

However, before the warps are woven as abovementioned, and after thewoofs are laid down in the manner shown in Fig. 3, each singledoublestranded woof l0, as shown in Fig. 4, is lifted from its peg H andthe circular loop l8, formed by passing the rope completely around thepeg H, is fixed by tying the same, as with a wire I9a, after twistingthe pair of threads H5 at substantially right angles, as shown.

In Fig. 1 the wire I! is shown terminated intermediate the length of awarp near the lower edge of the mat, and is continued intermediate 2.warp near the upper end of the mat. This omission is made for the sakeof simplicity and to avoid the needless repetition of the warpsthroughout the body of the mat.

At the upper edge of the mat, Fig. 1, the edge or end warp 16; iscomposed of two strands I6g, and this double stranded thread if passesthrough all of the end loops 18 of the woofs l6, but in the mannerillustrated in Fig. 1, that is, first one strand |6g passes over theadjacent sides of one pair of loops l8, then under the adjacent sides ofthe next pair of loops 3, and so on, and in the reverse direction thesecond strand lfig is so woven through the loops l8 that it passes underthe sides of those loops which the first strand 16g passes over, andvice versa. Finally, the free extremity Ila of the wire I1 islockthreaded in any suitable manner to prevent its unraveling, as, forinstance, by passing it through a number of the successive bights l9formed by the warps along one edge of the mat.

The cross-sectional views of Figs. 6 and 7 show the weave of the body ofthe finished mat. In Fig. 6, since one strand only of the doublestrandedwoof I6 is visible, only that one is shown, threaded between the warpsI60 l6e, l6h, lti, etc. Fig. 7 shows the alternate double-strandedthreads 46 passing through successive wave loops of the "two adjacentwarps [6h and ii.

The woofs [6 of this mat, together with the sturdy construction of theweave throughout, provide a very strong shock-absorbing and durableblasting mat.

I claim:

1. A woven blasting mat substantially rectangular in outline comprisinga single length of flexible wire having two-stranded woofs, the ends ofeach of said two strands being joined by a substantially circular closedloop at one edge of the 'mat, the opposite end of each of said strandsbeing-joined by a bight with the adjacent strand of .the next successivewoof, the warps of the body of the mat passing alternately over everyother of said woofs and under the inbetween woofs, the two outermostwarps at said one-edge of the mat being threaded through said closedloops.

"2. The mat set -forth in claim 1, each of said body warps passing underthose of said woofs adjacent sides of one adjacent pair of said loopsand .under the adjacent sides of the next pair of said loops, the otherof said outermost two warps ipassing alternately under said adjacentsides of said one adjacent pair of said loops and over said "adjacentsides of said next pair of said loops.

JGSEPI-I S. MAZZELLA.

REFERENCES CITED The following lreferenlces are .of record in -the idle=o'f :this patent:

UNITED STATES PATENTS Number Name Date =1;324,627 "Stewart iDec.9, 19-192,004,364 Best c..- June all, 1935 2361,1613 Arthur n. Oct. :24, 1944

